Many engineers are paying increasing attention to road stabilization in order to build quality roads that can hold up against rough and heavy use.

The objective is to improve strength, reduce soil plasticity and lower compressibility either by binding the soil particles or waterproofing them or a combination of both. It involves the application of mechanical processes and chemical additives to increase the density of the soil. Higher the density of a material fewer the voids present in it.

What Is Road Stabilization Process?

Voids are most damaging to the integrity of a road or for that matter any type of construction. As they trap moisture and air, they become less stable and disintegrate under pressure and changing temperature and moisture conditions. Soft soils such as silt, organic soils and clayey peat are the type of soils that need to be first stabilized before they can be used because of their high porosity and organic content.

The steps constituting its process vary based on the location, time requirements, available machinery, budget and environmental conditions. However, the following described steps are common to most processes.

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This is the key to successful soil stabilization. There is no standard method and the additives that can be used vary based on the soil type. Strength, compressibility, permeability, durability and volume stability are some of the properties that are of chief concern in road stabilization.

Soils found across the globe are of different varieties and the same can be said about their engineering properties. Thus, soil samples are first tested to determine their engineering and environmental properties. Based on the assessment, a particular additive is selected and used to cure the soil sample. The cured sample is then tested again to determine whether or not it produces the desired results.


There is ex-situ and in-situ stabilization. In-situ stabilization involves stabilizing the soils at its original site while ex-situ stabilization involves curing the soil by removing the bulk of soil and transporting it to another treatment site. In-situ it is the preferred option because it is cost effective and time efficient.

In any case, the existing or parent soil is pulverized using a rotary mixer, this means it is crushed into fine particles. Additional base materials and aggregates are added during this stage. The moisture content of the soil should be at an optimum level for the reaction to take place successfully when the additive is added. Hence, dry soils are made damp while soils with high water content are made dry through water drainage.


After the soil is prepared, the additives are introduced. They are either applied dry or sprayed. The method of application varies based on the additive being used. Selected additives require several applications and repeated mixing.


A stabilizing machine makes several passes over the soil so that it mixes the soil and the additives homogenously. Selected additives require to be mixed immediately after they are introduced as they set very quickly.


Compaction increases the density of the soils and also moves it towards achieving a smooth surface. In the process of compaction, different machines are employed namely vibratory pad foot, a pneumatic compactor and tandem drum roller. The last two are used to shape and trim the surface to remove depression marks and achieve a proper crown and grade and a smooth surface.


This is the final step in the process. It is what helps the additive to achieve its full engineering potential. A period of seven days is sufficient for proper curing. However, again the time varies based on the additive used to stabilize road soils.

Global Road Technology offers simple solutions to a global challenge of building cheaper greener and longer lasting infrastructure.


Through the use of technologically advanced polymers, they create stable road surfaces from existing soils. Their awareness of environment conservation and innovative idea of creating virtually maintenance for road Stabilization & free infrastructure raises the bar further. Our Mission “We provide the simple solution to a global problem of creating better and safer roads for people, industry and communities everywhere.”

For more information on Global Road Technology or Road Stabilization, Contact Us.